Misspelled
The ten-letter word for letters that are not vowels is consonants.
grown, wrong
6 letters word means madness is "Insane".
It would be either a prefix or a suffix. Prefix means the letters before, and suffix means the letters after the word.
A five-letter word that means "maybe" is "might."
The letters spell the word conundrums. It means a confusing and difficult problem or question.
Omit is the four letter word that means to leave out.
Repeal
An eight letter word that means "to remember details" is "memorize".
By adding the letter R to the word HIRES, and rearranging the letters, you can form the word SHRIEK, which means to scream.
Dart?
Nonimportation